Devel::Leak - Utility for looking for perl objects that are not reclaimed. |
Devel::Leak - Utility for looking for perl objects that are not reclaimed.
use Devel::Leak; ... setup code
my $count = Devel::Leak::NoteSV($handle);
... code that may leak
Devel::Leak::CheckSV($handle);
Devel::Leak has two functions NoteSV
and CheckSV
.
NoteSV
walks the perl internal table of allocated SVs (scalar values) - (which
actually contains arrays and hashes too), and records their addresses in a
table. It returns a count of these ``things'', and stores a pointer to the
table (which is obtained from the heap using malloc())
in its argument.
CheckSV
is passed argument which holds a pointer to a table created by
NoteSV
. It re-walks the perl-internals and calls sv_dump()
for any ``things''
which did not exist when NoteSV
was called. It returns a count of the number
of ``things'' now allocated.
Note that you need a perl built with -DDEBUGGING for
sv_dump()
to print anything, but counts are valid in any perl.
If new ``things'' have been created, CheckSV
may (also) report additional
``things'' which are allocated by the sv_dump()
code.
This little utility module was part of Tk until the variable renaming in perl5.005 made it clear that Tk had no business knowing this much about the perl internals.
Nick Ing-Simmons <nick@ni-s.u-net.com>
Devel::Leak - Utility for looking for perl objects that are not reclaimed. |